KISS stands for “Keep It Simple, Stupid.” In software and security design, it means choosing the clearest workable solution and avoiding unnecessary complexity. The goal is not minimalism for its own sake; it is to make systems easier to understand, review, test, and maintain. Simpler designs usually have fewer dependencies, fewer special cases, and fewer places where configuration or code can go wrong.
In cyber security, KISS matters because complexity increases attack surface and operational risk. Complicated architectures can hide misconfigurations, inconsistent controls, and forgotten components that attackers may exploit. Defenders use the same principle to build systems that are easier to harden, patch, monitor, and audit. A KISS approach helps teams keep control of what a system can do, spot unnecessary risk faster, and reduce the chance that security failures hide in hard-to-reach layers.